Chain hoist



Jug? Q, 1946. c. s. SCHROEDER 2,403,462

CHAIN HOIST Filed Feb. 25,1944 2 Sheets-Sheet 1 A TTORNE Y July 9, 1946.

C. S. SCHROEDER CHAIN HOIST v Filed Feb. 25, 1944 2 Sheets-Sheet 2 INVENTOR 6. 61 dc/lr-oao er' 1 ATTORNEY H. H-Q i a Patented July 9, 1946 I CHAIN HOIST Charles 'S. Schroeder, Philadelphia, Pa., ,assignor fto The Yale & Towne Manufacturing Company, Stamford, Conn., a corporation of Connecticut Application February 25, 1944, Serial No. 523,798

1 Claim. 1, This invention relates to a hoist, and more particularly to a chain hoist of the type utilizing a load sheave rotated through the intermediary of A feature of my invention resides in the con-1 ception of an extremely simple structural arrangement whereby I am able to build a much smaller chain hoist than those found in. .theprior art, while employing ball bearings that normally compel an increase in size rather than a decrease in the size of thehoist structure.

A further. feature of this part of my'i'nvention resides in the construction of the hoist of'two main plates, which in combination with a bearing plate, comprise the sole structural members'of the hoist. Thus, the remaining parts areoperating parts or mere fastening members. This is an extremely important feature of my invention.

A still further feature of my invention resides in the particular manner in which the drive shaft of my hoist is supported relatively to the load sheave. A further feature of my inventio relates to securing means for a chain guide used with the hand wheel of the hoist.

Referring now to the drawings,

Fig. 1 is a, vertical section through the hoist of my invention.

Fig. 2 is a view looking at the hoist from the right of Fig. 1.

Figs. 3 and 4 are respectively an end and an elevation of the bearing plate secured to one of the main plates forming part of my invention.

Fig. 5 is a section showing a modification of my invention.

Fig. 6 is a section of the center portion of a modified load sheave of the sprocket type.

Referring now more particularly to the draw lugs, and especially Figs. 1 to 4 inclusive, my hoist utilizes a first main plate H] and a second main plate These main plates are held together, and in spaced relation, by a series of bolts 2 and spacer sleeves I3, together with a hook supporting bar [4. A supporting hook I5 is mounted on the bar. M in a conventional manner.

The main plate I0 is formed so as to support at IS the ball bearing l1, and at |8 the ball bearing l5. As is quite apparent, the ball bearings I! and H! are concentric, and are therefore adapted to support for rotation the coaxially rotating load sheave 2i) and drive shaft 2|. The load sheave 20 is of course supported at its right a load hook 25.

end by the bearing I-l on the main plate H1. At its other end the load sheave Zfiis supported by aball bearin 22.mounted on the main plate The load sheave is formed with a series of pockets 2.3 for the links 24 of a load chain that supports Rotation of the load sheaveZU moves the chain links 24 so as to lift and lower a load carried on the load hook 25.

The drive shaft zl is supported at its right end by the ball bearing l9, and has-formed on its other end pinion 30 that is in driving relation to the teeth of a pair of gears 3|. The gears 3| are termed by me intermediate gears, and areformed as parts of intermediate shafts 32 on which are formed intermediate pinions 33.. The intermediate pinions 33 are in driving relation to a gear 34 that is splined .at.35 to the load sheave 29. It is obvious that rotation of the drive shaft 2| will effect rotation. of the gear 34 and load sheave20 through the medium of the intermediate gears 3| and the intermediate pinions 33. It will also be seen that the gears 3| will, through the intermediary of the pinion 30, support the left end of the drive shaft 2| for rotation, the opposite end of the shaft being of course carried on the ball bearing l9. It will also be noted that drive shaft 2|, while rotating concentrically with sheave 20 and in a bore thereof, is spaced therefrom.

The intermediate shafts 32 are supported at their right ends by ball bearings 40 that are mounted on the main plate I At their left ends the shafts 32 are supported by ball bearings 4| that are carried on a bearing plate 42, best illustrated in Figs. 3 and 4. There, the plate 42 is shown equipped with caps 43 in which the ball bearings 4| are mounted. It is also shown formed.

on a stub shaft 53 carried by the main plate I!) and cooperates with the teeth of the ratchet disk 43. The manner in which the hand wheel and the several parts associated therewith control the drive shaft 2| will not be herein set forth because the particular structure is well known in the hoist art.

7 For holding the chain links 41 in proper 00- action with the hand wheel 45, I utilize what is termed in the art a chain guide 55. This chain guide is formed of two parts held together by a bolt 56 as is best shown in Figs. 1 and 2. The bolt 56 passes through a downwardly extending part of the main plate Ill and thereby forms a rigid assembly of the parts of the chain guide 55. Each of the said parts of the chain guide 55 is formed with a bracket 51 that is adapted to be inserted betweenv pairs of lugs 58 formed integrally with the main bearing plate Ill. Because of this construction it is very simple indeed to assemble the parts of the chain guide 55 in their proper relation to the main plate In. A bolt 59 is thereafter passed through bores in each of the brackets 51 of the chain guide 55, and

4 which will be well understood by those skilled in the art. It will. be noted that as in the case of the modification of Fig. 1, 'in the modification of Fig. 6 the drive shaft 2| is mounted for rotation Within a bore in the load sheave but in spaced relation thereto, thereby contributing an extremely smooth and easy operating hoist mechanism.

I believe that the structure and operation of my invention will now be apparent to those skilled in the art.

in the mainplate ID, for securing theparts of the chain guide 55 in position.

From the description so far given, it is readily seen that I have contributed an extremely small 7 and compact hoist structure utilizing but three structural parts. Those structural parts are the main plates l0 and H and the bearing plate 42. The manner in which the three structural parts support the operating parts, and the further manner in which the operating parts are related, form a contribution of much merit to this art.

In Fig. 5 I illustrate a modified form 42a of the bearing plate 42. Thus, in Fig. 5, the bearing plate 42a is shown supporting a ball bearing 60 for the left endlia of the: drive shaft. It will be remembered that in the preferred form, the left end of the drive shaft 2| is carried by the pinion 30 through its, engagement with intermediate gears 3|.

In Fig. 6 I show amodified form of load sheave designated by reference numeral 20a. Thus, the load sheave 20a is formed with teeth 23a instead of the pockets 23 of the load sheave of the first modification. The teeth cooperate with aspro-cket roller chain 24a in a manner Inow claim:

'In a hoist of the class described, a pair of main plates, means securing said plates to one another in spaced relation, a load sheave, a ball bearing on one of said plates for supporting one end of said load sheave for rotation, a pair of concentric cup-shaped surfaces formed in stepped relation on the other of said plates, a

ball bearing nested into the larger of said stepped cup-shaped surfaces for supporting the other end of said load sheave, a second ball bearing nested in the smaller of said stepped cup-shaped surfaces andthereby retained against endwise movement in one direction, a drive shaft Within a central bore, of said load sheave and spaced therefrom, one end of said drive shaft supported by said second ball bearing and having a shoulder,

for retaining, said ball bearing against movement endwise in the opposite direction, a pinion on the other end of said drive shaft, a pair of intermediate shafts'supported on said one plate, intermediate gears formed on said intermediate shafts and in driving engagement with said pinion, said intermediate shafts and gears through said pinion alone supporting for rotation the other end of said drive shaft, and means whereby said intermediate gears rotate said load sheave;

CHARLES S. SCHROEDER. 

